Welcome!The Topic For Today Is…

Your TopicTools we use to measure

Resistance and Resistivity

Current Electricity

Series and Parallel Circuits

Cut out the Static

200 200 200 200 200

400 400 400 400 400

600 600 600 600 600

800 800 800 800 800

1000 1000 1000 1000 1000

Bonus Question: 5000 pts

Topic 1: 200• Question:• Ammeters measure…• Answer• Current

Topic 1: 400• Question:• Voltmeters measure…• Answer• Potential Difference

Topic 1: 600• Question:• Ammeters are connected in

while voltmeters are connected in .

• Answer• Series; Parallel

Topic 1: 800• Question:• Ammeters have resistance

while voltmeters have resistance.

• Answer• Very little; Very much

Topic 1: 1000• Question:• A galvanometer is…• Answer• A device to measure extremely small

currents.

Topic 2: 200• Question:• What is resistivity?• Answer• Resistivity is an intrinsic property of a

material, which is a measure of the conductive ability of the material. The lower the value, the more conductive the material is.

Topic 2: 400• Question:• What is a resistor?• Answer• A component in an electrical circuit, which

“resists” the flow of electrons.

Topic 2: 600• Question:• What is Resistance?• Answer• The ratio of the voltage drop across a device

to the current flowing in it.

Or the hindrance to the flow of charge.

I

VR

Topic 2: 800• Question:• As the length of a conductor increases, its

resistance will while its resistivity will .

• Answer• Increase; remain the same

Topic 2: 1000• Question:• Determine the resistance of a copper wire

that is 2.00 meters in length and has a radius of 150.m

• Answer• 0.487

Topic 3: 200• Question:• Conventional Current is…• Answer• the flow of positive charge.

Topic 3: 400• Question:• A 40 Volt battery is connected to a 20 Ohm

resistor. What is the current flowing in the circuit?

• Answer• 2 Amperes

Topic 3: 600• Question:• 2 amperes of current is equivalent to how

many electrons per second?• Answer• 1.25x1019 electrons per second

Topic 3: 800• Question:• A cloud transfers 25 Coulombs of charge to

the earth during a discharge lasting 0.75 seconds. What is the current flow.

• Answer• 33.3 Amperes

Topic 3: 1000• Question:• A cloud transfers 10,000 Coulombs of charge

to the earth during a discharge lasting 0.50 seconds. If the potential difference between the cloud and the ground is 25,000,000 Volts, what is the resistance of the atmosphere?

• Answer• 1250 Ohms

Topic 4: 200• Question:• How do you find the total resistance and

voltage in a series circuit?• Answer• You sum up the individual values for R and V.

Topic 4: 400• Question:• Adding another resistor to a series circuit will

cause the equivalent resistance to…• Answer• Increase

Topic 4: 600• Question:• A 2, 4 and 6 Ohm resistor are connected in

parallel. Which resistor will have the greatest current and which one will have the least?

• Answer• The 2 resistor will have the greatest current

while the 6 resistor will have the least. Remember: Electricity follows the path of least resistance.

Topic 4: 800• Question:• Determine the equivalent resistance for 3

identical 6 resistors connected in series and parallel

• Answer• In series: Req = 18

• In parallel: Req = 2

Topic 4: 1000• Question:• A 16 and 26 Ohm resistor are connected in

parallel across a potential difference of 40. V. What is the current in the circuit?

• Answer• 4.0A

Topic 5: 200• Question:• Electric field lines go from to

.• Answer• Positive to negative

Topic 5: 400• Question:• The units for the electric field intensity are:• Answer• N/C or V/m

Topic 5: 600• Question:• Conservation of charge means…• Answer• The total charge of a system is constant. It

can neither be created, nor destroyed.

Topic 5: 800• Question:• Explain why a neutral object can be attracted

to a charged object.• Answer• Due to separation of charge. Electrons are

either attracted to the surface or repelled resulting in a surface charge.

Topic 5: 1000• Question:• A proton experiences a force of 2.0x10-20N.

What is the electric field?• Answer• 0.125N/C

Bonus Question: 5000 pts.

• Question:• A proton is released from rest between two

parallel plates where the electric field strength is 25,000 V/m. Determine the acceleration of the proton.

• Answer• 2.4x1012 m/s2

The Winner Of The Last RoundWrite Down How Much Money

You Are Willing To RiskIf You get the Question write you win that money

If you get it wrong you Loss the money!

The Winner Of The Last RoundWrite Down How Much Money

You Are Willing To RiskIf You get the Question write you win that money

If you get it wrong you Loss the money!